diff --git a/package.json b/package.json
index 2b17853..99ad112 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "koa-router": "^7.2.1",
     "koa-static": "^4.0.1",
     "mongodb": "^2.2.31",
-    "nodemailer": "^2.4.2",
+    "nodemailer": "^4.0.1",
     "openpgp": "^2.3.0",
     "winston": "^2.3.1",
     "winston-papertrail": "^1.0.5"
@@ -41,7 +41,6 @@
   },
   "greenkeeper": {
     "ignore": [
-      "nodemailer",
       "sinon"
     ]
   }